Am I missing something with the Aggregrate operator?

I am trying a simple aggregrate function to Count, sort by averages of two columns. Seems like a simple exercise. Apologies, I come from Alteryx and the option to change from integer to float or to string was integrated in their tool.
I Love Rapidminer but this seems to be an east function I am unable to get. Can anybody please help?


Why am I not seeing any atributes/column headers?